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IV68447: GARBAGE COLLECTOR CRASHES WHEN GENERATING JAVACORE

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV/GPF is received when a user issues a
    user event to generate Javacore files.
    .
    Stack Trace: The native stack trace looks like
    this:incrementalScanCacheBySlot__20MM_ParallelScavengerFP22MM_En
    vironmentStandardcompleteScan__20MM_ParallelScavengerFP22MM_Envi
    ronmentStandardworkThreadGarbageCollect__20MM_ParallelScavengerF
    P22MM_EnvironmentStandardrun__23MM_ParallelScavengeTaskFP20MM_En
    vironmentModronslaveEntryPoint__21MM_ParallelDispatcherFP20MM_En
    vironmentModrondispatcher_thread_proc2__FP13J9PortLibraryPvj9sig
    _protectdispatcher_thread_procthread_wrapper
    .
    

Local fix

Problem summary

  • The problem can occur when a Javacore file is generated while a
    garbage collection is in progress. Javacore generation queries
    the state of certain objects (e.g. threads), which may in turn
    update internal caches. If Javacore generation queries an object
    that the garbage collector is currently processing, these cache
    updates may lead to memory corruption.
    

Problem conclusion

  • The JVM has been updated so that Javacore generation does not
    update internal caches.
    .
    This APAR will be fixed in the following Java Releases:
       6    SR17      (6.0.17.0)
       6 R1 SR8 FP4   (6.1.8.4)
       7    SR9       (7.0.9.0)
       7 R1 SR3       (7.1.3.0)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the Service
    Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV68447

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-01-09

  • Closed date

    2015-01-14

  • Last modified date

    2015-05-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R600 PSY

       UP

  • R260 PSY

       UP

  • R270 PSY

       UP

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Document Information

Modified date:
08 January 2022